<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="test"></div>
    <script type="text/javascript" src="../js/17/react.development.js"></script>
    <script type="text/javascript" src="../js/17/react-dom.development.js"></script>
    <script type="text/javascript" src="../js/17/babel.min.js"></script>

    <script type="text/babel">
        class Time extends React.Component {
            state = {date: new Date()}

            componentDidMount() {
                setInterval(() => {
                    this.setState({
                        date: new Date()
                    })
                },  1000)
            }

            render() {
                return (
                    <div>
                        <h1>hello</h1>
                        <input type="text"/>
                        <span>现在是: {this.state.date.toTimeString()}</span>    
                    </div>
                )
            }
        }

        ReactDOM.render(<Time/>, document.getElementById("test"))
    </script>
</body>
</html>